Locking net device of mobile terminal and identifying method between modules

The invention discloses a locking net device of a mobile terminal, which comprises a mobile terminal module used for receiving user identification information and a locking module used for controlling whether the mobile terminal module works according to whether the user identification information has network access authority. The mobile terminal module and the locking net module respectively comprise first secret key information and second secret key information to conduct mutual identification. The locking net device utilizes two way symmetrical encryption algorithm to conduct mutual identification between the mobile terminal module and the locking net module and achieve the aim that the mobile terminal locking net device is not easy to break, for example, the locking net device can effectively prevent the locking net module from being dismantled physically.